APA استشهاد

Brown, L. (2003). State of the World 2003 (20.).

استشهاد بنمط شيكاغو

Brown, Lester. State of the World 2003. 20. Worldwatch Institute, Washington, 2003.

MLA استشهاد

Brown, Lester. State of the World 2003. 20. 2003.